[nativeit]

It’s relatively old at this point, but I’m still getting excellent performance from the Teensy 4.1. It’s a little more expensive, around $30, but runs Cortex M7 @ 600MHz and includes a generous compliment of I/O and protocols.

[15155]

The IMRXT1011 is $1.70 when bought in bulk from China from various vendors - it can do most of the things the Teensy has.

A reputable vendor: https://www.lcsc.com/product-detail/Microcontrollers-MCU-MPU...

The IMXRT1064 can be had at $7: https://www.lcsc.com/product-detail/Microcontrollers-MCU-MPU...

[analog31]

I think it's still king of the hill. I've bought dozens.